<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>Title</title>
    <style>
        /*未访问状态*/
        a:link{
color: aqua;
        }
        /*已访问状态*/
        a:visited{
            color: blueviolet;
        }
        /*已选中状态*/
        a:active{
            color: red;
        }
        /*鼠标悬浮状态*/
        a:hover{
            color: blue;
        }
    </style>
</head>
<body>
<a href="03-选择器案例.html" >案例</a>
</body>
</html>